It sounds pretty stupid, self-defeating and is conflating two different things, bug reports and support.

Bug reports should be all that goes on Github, for people telling you that your code is broken you should be paying them, they're doing you a favour.

For support, that should stay off Github and be a user generated forum, If you build a community there it'll take care of itself leaving you to just deal with the code.

If you need money you could always offer priority support for those who donate or contribute in some other way.